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參數資料
| 型號： | LM1253AAE/NA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 畫面疊加 |
| 英文描述： | ON-SCREEN DISPLAY IC, PDIP28 |
| 封裝： | 0.600 INCH, PLASTIC, DIP-28 |
| 文件頁數： | 4/61頁 |
| 文件大小： | 1671K |
| 代理商： | LM1253AAE/NA |
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Pin Descriptions (Continued)
VFLYBACK vertical flyback pulse is kept high during that
initial period to prevent the output VBLANK from switching
between high and low states.
Loss of vertical flyback pulse implies that the monitor is not
scanning, and therefore no image is being displayed. The
VBLANK pulses are still required by the LM2453 CRT driver
in order to maintain correct bias conditions in the CRT until
the power supplies are switched off, but video will be set at
black level to prevent front of screen problems, using the
NO_VID line. See also the
Loss of Vertical Flyback Pulse
section.
Figure 29 shows the external schematic of pin 15,
Figure 19 shows the internal schematic.
Pin 16 — SDA The I
2C data line. A pull up resistor of about
2k
should be connected between this pin and +5V. A 300
resistor should be connected in series with the data line to
protect the IC against arcing.
Figure 29 shows the external
schematic of pin 16,
Figure 20 shows the internal schematic.
Pin 17 — SCL The I
2C clock line. A pull up resistor of about
2k
should be connected between this pin and +5V. A 300
resistor should be connected in series with the clock line to
protect the IC against arcing.
Figure 29 shows the external
schematic of pin 17,
Figure 20 shows the internal schematic.
Pin 18 — Digital Ground Ground for the OSD section of the
LM1253A. All ground pins of the LM1253A should be con-
nected together by a ground plane under the LM1253A. See
Figure 31, which shows a sample layout.
Pin 19 — Digital Supply 5V supply for the OSD section of
the LM1253A. A 0.1 F capacitor should be connected be-
tween pin 18 and pin 19, as close as possible to the
LM1253A.
DS101265-5
FIGURE 10. Vertical Flyback Input Pulse
LM1253A
www.national.com
12
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相關代理商/技術參數 |
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|---|---|
| LM1253AN | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Monolithic Triple 180 MHz I2C CRT Pre-amp With Integrated Analog On Screen Display (OSD) Generator |
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| LM-1256_1 | 制造商:ROHM 制造商全稱:Rohm 功能描述:16】16 matrix displays |
| LM-1256LB1 | 制造商:ROHM 制造商全稱:Rohm 功能描述:16】16 matrix displays |
| LM125AN | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:VOLTAGE REGULATORS |
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